YOU'REEEEE OUTTTAAA HEERRRREEEE ...
Only kidding.
The error of your argument is that you consider online forums to be equivalent to real life, face to face interactions in a home or office. They are two different environments and have their own social norms and ways of doing things.For example, I don’t respond (normally) to unsolicited email and I don’t feel I need to tell them why I'm not responding.
>Take the principle to your household or to your workplace. Suppose you no longer will (want to) hear what certain others are telling you and as a consequence you also don't react to them. Suppose you also have not informed them about this. You'll be in trouble within one day. What's hilarious about that.
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>>Although I haven't used it (yet) the purpose of a filter is to filter, not also to inform of the filtering. If the person wants to inform the twitted person they can do so using various other techniques. I thinks the whole discussion is hilarious.
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In the End, we will remember not the words of our enemies, but the silence of our friends - Martin Luther King, Jr.